Rectifying dialyzer, membrane and process

Details Rectifying dialyzer, membrane and process Rectifying dialyzer, membrane and process

C - Chemistry, Metallurgy

12

M

C12M 3/06 (2006.01) A61M 1/20 (2006.01) B01D 61/14 (2006.01) B01D 61/24 (2006.01) B01D 63/06 (2006.01) B01D 69/02 (2006.01) B01D 69/08 (2006.01) C12M 1/12 (2006.01)

Patent

CA 2104969

2104969 9314186 PCTABS00024 The invention provides dual-skinned membranes useful as one way or rectifying membranes which reduce back filtration of solute molecules in dialysis and which improve nutrient supply and product recovery in membrane bioreactors. The membranes are dual-skinned polymeric materials preferably in the form of hollow fibers. The membranes have skins of polymer on the opposite sides with differing porosity or sieving coefficient characteristics. The membranes are formed by extruding a polymer dissolved in a solvent while contacting at least one surface with a non-solvent which is miscible with the solvent. The other surface is contacted with a non-solvent. The two non-solvents are either different from each other or one of the non-solvents contains a soluble additive which changes the porosity of the skin formed on the dissolved extruded polymer. Improved dialysis devices are formed by using bundles of the hollow fiber membranes as a dialysis means having rectifying properties. Improved bioreactors are formed by using bundles of hollow fiber membranes as a growth vessel having rectifying properties.

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